(19)
(11) EP 0 300 702 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.03.1989 Bulletin 1989/11

(43) Date of publication A2:
25.01.1989 Bulletin 1989/04

(21) Application number: 88306514.6

(22) Date of filing: 15.07.1988
(51) International Patent Classification (IPC)4: G01N 3/04
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 18.07.1987 GB 8716989

(71) Applicant: BRITISH AEROSPACE PUBLIC LIMITED COMPANY
Farnborough, Hants. GU14 6YU (GB)

(72) Inventors:
  • Ralphs, Colin Arthur
    Preston, Lancs PR4 1AX (GB)
  • Murdock, Anthony
    Preston, Lancs PR4 1AX (GB)

(74) Representative: Eastmond, John et al
British Aerospace plc Corporate Intellectual Property Department Park East, PO Box 87, Farnborough Aerospace Centre
Farnborough, Hants GU14 6YU
Farnborough, Hants GU14 6YU (GB)


(56) References cited: : 
   
       


    (54) Compression test machine


    (57) A stabilisation and gripping device for use with a compression test machine to measure strain vs load characteristics of, in partricular composite material uni-directional ply, specimens includes a guide sleeve (1), two hollow open ended end-blocks (2) adapted to slidably fit within the guide sleeve and to co-operate with parts of the machine for applying compressive forces to the specimen, and two pairs of collets (6) each pair for gripping a separate one of two ends of the specimen (9), said collets having a planar gripping inner surface (7), at least one outer surface tapered with respect to said gripping surface and corresponding to a tapered inner surface of said end blocks, and a planar outer surface for co-operation with a substantially planar inner surface of said end blocks so that said collets may be non-rotatably inserted in said end blocks in a position in which the respective inner surfaces are parallel and pairs of said inner surfaces define a location for the specimen ends.







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